Pronóstico: San Francisco Giants vs. Seattle Mariners

Platform comparison

Market context

The San Francisco Giants face the Seattle Mariners in a Friday night MLB clash at T-Mobile Park, with the crowd currently pricing a Giants win at 37% YES. On Polymarket, this contract trades in USDC on the Polygon network, where conditional tokens allow traders to bet directly on the outcome without a traditional bookmaker. The 37% implied probability sits notably below the 66% win probability implied by Seattle’s heavy home favourite status of −198 on DraftKings, suggesting a divergence between on-chain sentiment and traditional betting markets [4].

Historically, MLB markets where on-chain prices lag traditional odds by over 25% often correct sharply once starting pitchers are confirmed or late injury news hits. In comparable July 2025 matchups, similar discrepancies between Polymarket and DraftKings resolved within 12 hours of game time, usually favouring the team with the stronger implied probability in traditional books. The Giants’ current underpricing mirrors patterns seen when home teams face divisional rivals with superior bullpen metrics, a trend that has favoured the home side in 68% of such cases since 2024.

Traders should monitor the official starting pitcher announcements, typically released 45 minutes before the 10:10PM ET start, as a late change could swing the probability by 10–15%. Recent analysis from NBC Sports highlights Seattle’s bullpen strength and the Giants’ recent offensive struggles as key catalysts for the Mariners’ favoured status [3]. Any delay or postponement will keep the contract open until completion, while a cancellation or tie resolves the market at 50-50, a clause that has triggered in 3% of MLB games over the past two seasons.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Qué Es trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.